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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

West Monroe Water System

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

MORE ABOUT THIS CONTAMINANT

 

72

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND120ND
20150.121 ppm108ND - 0.500 ppm
20160.102 ppm124ND - 0.570 ppm
2017ND120ND
20180.0583 ppm122ND - 0.350 ppm
20190.0119 ppm142ND - 0.0830 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2014-03-17AD89845ND
2014-03-17AD89840ND
2014-03-17AD89845ND
2014-03-17AD89840ND
2014-09-02AD96389ND
2014-09-02AD96384ND
2014-09-02AD96379ND
2014-09-02AD96389ND
2014-09-02AD96384ND
2014-09-02AD96379ND
2014-09-04AD96488ND
2014-09-04AD96488ND
2015-10-28352139910060.500 ppm
2015-10-28352139910070.0330 ppm
2015-10-2835213991008ND
2015-10-28352139910090.0280 ppm
2015-10-28352139910100.0420 ppm
2015-10-28352139910100.0420 ppm
2015-10-28352139910090.0280 ppm
2015-10-2835213991008ND
2015-10-28352139910070.0330 ppm
2015-10-28352139910060.500 ppm
2016-10-14352720110100.0390 ppm
2016-10-1435272011009ND
2016-10-1435272011009ND
2016-10-14352720110100.0390 ppm
2016-11-10352782080130.570 ppm
2016-11-1035278208012ND
2016-11-1035278208011ND
2016-11-1035278208010ND
2016-11-10352782080130.570 ppm
2016-11-1035278208012ND
2016-11-1035278208011ND
2016-11-1035278208010ND
2017-03-1535301204006ND
2017-03-1535301204006ND
2017-03-2235302309005ND
2017-03-2235302309005ND
2017-09-0535334988003ND
2017-09-0535334988002ND
2017-09-0535334988001ND
2017-09-0535334988003ND
2017-09-0535334988002ND
2017-09-0535334988001ND
2017-09-1835337315002ND
2017-09-1835337315002ND
2018-07-1635405319001ND
2018-07-1635405319001ND
2018-10-1635424738004ND
2018-10-1635424738009ND
2018-10-1635424738003ND
2018-10-1635424738002ND
2018-10-16354247380010.350 ppm
2018-10-16354247380010.350 ppm
2018-10-1635424738002ND
2018-10-1635424738003ND
2018-10-1635424738004ND
2018-10-1635424738009ND
2019-12-0235517000001ND
2019-12-0235517000001ND
2019-12-0635518124001ND
2019-12-0635518124006ND
2019-12-0635518124005ND
2019-12-0635518124004ND
2019-12-0635518124003ND
2019-12-06355181240020.0830 ppm
2019-12-0635518124001ND
2019-12-0635518124006ND
2019-12-0635518124005ND
2019-12-0635518124004ND
2019-12-0635518124003ND
2019-12-06355181240020.0830 ppm